Lift VFS from clang to llvm (NFC)

This patch moves the virtual file system form clang to llvm so it can be
used by more projects.

Concretely the patch:
 - Moves VirtualFileSystem.{h|cpp} from clang/Basic to llvm/Support.
 - Moves the corresponding unit test from clang to llvm.
 - Moves the vfs namespace from clang::vfs to llvm::vfs.
 - Formats the lines affected by this change, mostly this is the result of
   the added llvm namespace.

RFC on the mailing list:
http://lists.llvm.org/pipermail/llvm-dev/2018-October/126657.html

Differential revision: https://reviews.llvm.org/D52783

llvm-svn: 344140

1 files changed, 4 insertions, 4 deletions

diff --git a/clang-tools-extra/clangd/CodeComplete.cpp b/clang-tools-extra/clangd/CodeComplete.cpp
index 9c634f5e8c4..92018b19325 100644
--- a/clang-tools-extra/clangd/CodeComplete.cpp
+++ b/clang-tools-extra/clangd/CodeComplete.cpp
@@ -986,7 +986,7 @@ struct SemaCompleteInput {
   const PreambleData *Preamble;
   StringRef Contents;
   Position Pos;
-  IntrusiveRefCntPtr<vfs::FileSystem> VFS;
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS;
   std::shared_ptr<PCHContainerOperations> PCHs;
 };
 
@@ -1007,7 +1007,7 @@ bool semaCodeComplete(std::unique_ptr<CodeCompleteConsumer> Consumer,
     // working dirs.
   }
 
-  IntrusiveRefCntPtr<vfs::FileSystem> VFS = Input.VFS;
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS = Input.VFS;
   if (Input.Preamble && Input.Preamble->StatCache)
     VFS = Input.Preamble->StatCache->getConsumingFS(std::move(VFS));
   IgnoreDiagnostics DummyDiagsConsumer;
@@ -1567,7 +1567,7 @@ speculateCompletionFilter(llvm::StringRef Content, Position Pos) {
 CodeCompleteResult
 codeComplete(PathRef FileName, const tooling::CompileCommand &Command,
              const PreambleData *Preamble, StringRef Contents, Position Pos,
-             IntrusiveRefCntPtr<vfs::FileSystem> VFS,
+             IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
              std::shared_ptr<PCHContainerOperations> PCHs,
              CodeCompleteOptions Opts, SpeculativeFuzzyFind *SpecFuzzyFind) {
   return CodeCompleteFlow(FileName,
@@ -1580,7 +1580,7 @@ SignatureHelp signatureHelp(PathRef FileName,
                             const tooling::CompileCommand &Command,
                             const PreambleData *Preamble, StringRef Contents,
                             Position Pos,
-                            IntrusiveRefCntPtr<vfs::FileSystem> VFS,
+                            IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
                             std::shared_ptr<PCHContainerOperations> PCHs,
                             const SymbolIndex *Index) {
   SignatureHelp Result;